练习题 · 英文原题 · OC-MA-TST-03
There are 71 students in Year 4. On excursion day, 8 of them are away. Each minibus has 12 seats. Two teachers must ride in every minibus, and each teacher uses one of the 12 seats.
What is the smallest number of minibuses needed for all the students who go on the excursion?
查看答案与解析(英文)
答案: C
Answer: C (7)
- Students who go: 71 − 8 = 63.
- Each minibus has 12 seats, and 2 are used by teachers, so 10 seats are left for students.
- 6 minibuses carry 6 × 10 = 60 students. That leaves 3 students without a seat.
- Those 3 students need one more minibus: 6 + 1 = 7 minibuses.
Why the other options are wrong
- A (5): This puts 12 students in each minibus, forgetting the teachers' seats, and also leaves out the students left over.
- B (6): This fills 6 minibuses with 10 students each but forgets the 3 students who still need a seat.
- D (8): This uses all 71 students, but 8 of them are away and do not need a seat.
- E (14): This is the number of teachers needed for 7 minibuses, not the number of minibuses.

